Adding Firewire to Mythbuntu

[Office]

Hello Everyone,
	I'm running Mythbuntu 14.04 on my home theater and am currently 
controlling my cable box via serial IR Blaster. I'm looking to upgrade my 
cable box and the new box is best controlled by firewire. My home theater does 
not have that connection and I don't want to blindly stick a card in only to 
find it comes with a bad linux driver. Any suggestions on a good card? or what 
to look for when adding this to my system?
Thanks in advance!
Andrew C.